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ServiceNow Software Engineer Interview Experience

Software Engineer

ServiceNow
August 28, 2025
10 Questions
Selected

Summary

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The interview process at ServiceNow consisted of four rounds with a focus on technical and behavioral assessments. Candidates faced a variety of coding questions related to data structures and algorithms in the first two rounds, followed by system design in the later stages. The interview overall was moderately challenging, requiring a solid understanding of data structures and conceptual knowledge in programming, especially JavaScript.

1

Round 1

#1

Remove Nth Node from Linked List

Given a linked list, remove the Nth node from the end of the list. The solution should maintain a linear time complexity and constant space complexity. Provide the implementation details and discuss edge cases.
linked-list
twopointers
algorithm
Medium
#2

Best Time to Buy and Sell Stock

You are given an array where each element represents the price of a stock on a given day. Write an algorithm to determine the maximum profit you can achieve by buying on one day and selling on another. Discuss the constraints and provide examples.
array
dynamic-programming
stock
Medium
2

Round 2

#1

Detect Cycle in a Linked List

Write a function to determine if a linked list has a cycle in it. If there is a cycle, return the node where the cycle begins. Discuss the approach and the time complexity of your solution.
linked-list
cycle-detection
algorithm
Medium
#2

Find Node Where Cycle Begins

Given a linked list with a cycle, write a method to find and return the node at which the cycle begins. Discuss the logic behind your approach, including any flowchart or diagram if necessary.
linked-list
cycle-detection
algorithm
Medium
#3

JavaScript Conceptual Questions

Discuss the concepts of closures and the 'this' keyword in JavaScript. Provide examples that highlight their behavior in different scopes.
javascript
closures
theory
Medium
3

Round 3

#1

String-Based Coding Question

Given a string, write a function to determine if it is a palindrome. Discuss the approach and any constraints you need to consider, such as case sensitivity.
string
palindrome
algorithm
Easy
#2

Discussion on Past Experience

Share your experiences with previous projects, focusing on the challenges faced during development and how you overcame them. Highlight any key learnings that are relevant to the role you're applying for.
experience
behavioral
discussion
Easy
4

Round 4

#1

System Design: Design a Database for a Multi-Stage System

Design a database schema for a system that manages entities with multiple stages, evaluations, and results over time, supporting repeated attempts and outcomes at different stages. Discuss your design choices and any trade-offs involved.
system-design
database
Medium
#2

Discussion on Past Experience

Discuss your past work experiences and how they relate to this position. Focus on your contributions, team dynamics, and what you learned from previous roles.
experience
behavioral
discussion
Easy
#3

Behavioral Questions

Prepare for behavioral questions such as 'Tell me about a time when you faced a difficult challenge.' Discuss the STAR method (Situation, Task, Action, Result) for structuring your answers.
behavioral
star-method
Easy
dsalinked-listjavascriptsystem-designbehavioralservicenow
A

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